<!-- <script>
    Ground.prototype.lastname = "贺";
    function Ground(){

    }

    var ground =new Ground()

    Father.prototype = ground;
    function Father(){
        this.name = "jingwei";
    }

    var father = new Father();

    Son.prototype = father;
    function Son(){
        this.hobbit = 'reading'
    }
    var son = new Son();

    // console.log(son.name);
    console.log(son.lastname);
</script> -->

<script>

    Person.prototype = {
        name:"hanghang",
        sayName:function(){
            console.log(this.name);
        }
    }
    function Person (){
        this.name = "hengheng"
    }

    var p = new Person();
    p.sayName();
</script>